Year	Number
1996	-0.624154627323151
1998	-0.490328997373581
2000	-0.492341905832291
2002	-0.549481332302094
2003	-0.586459815502167
2004	-0.543261051177979
2005	-0.457726120948792
2006	-0.383815377950668
2007	-0.489426851272583
2008	-0.73821085691452
2009	-0.812300384044647
2010	-0.775662660598755
2011	-0.833723247051239
2012	-0.783729493618011
2013	-0.797584712505341
2014	-0.761600375175476
2015	-0.709302246570587
2016	-0.699988842010498
2017	-0.635465919971466
2018	-0.666681349277496
2019	-0.718147814273834
2020	-0.570837259292603
2021	-0.438364118337631
2022	-0.623640716075897